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authorPhilipp Rudo <prudo@linux.ibm.com>2019-04-08 14:24:08 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-04-29 10:44:04 +0200
commitc9896acc7851109d4e84c1e3a54cb1b9794dea6b (patch)
treee258e2c33f0f5def2a7ae88f991a175235406fa1 /drivers/s390/char
parent268a78404973594d1a7ec3a2b6a2474e0543a435 (diff)
downloadlinux-c9896acc7851109d4e84c1e3a54cb1b9794dea6b.tar.bz2
s390/ipl: Provide has_secure sysfs attribute
Provide an interface for userspace so it can find out if a machine is capeable of doing secure boot. The interface is, for example, needed for zipl so it can find out which file format it can/should write to disk. Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char')
-rw-r--r--drivers/s390/char/sclp.h4
-rw-r--r--drivers/s390/char/sclp_early.c2
2 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index 367e9d384d85..287382dc21c5 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -197,7 +197,9 @@ struct read_info_sccb {
u32 hmfai; /* 124-127 */
u8 _pad_128[134 - 128]; /* 128-133 */
u8 byte_134; /* 134 */
- u8 _pad_135[4096 - 135]; /* 135-4095 */
+ u8 _pad_135; /* 135 */
+ u16 cbl; /* 136-137 */
+ u8 _pad_138[4096 - 138]; /* 138-4095 */
} __packed __aligned(PAGE_SIZE);
struct read_storage_sccb {
diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c
index 8332788681c4..dae9de3d7c96 100644
--- a/drivers/s390/char/sclp_early.c
+++ b/drivers/s390/char/sclp_early.c
@@ -40,6 +40,8 @@ static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
sclp.has_gisaf = !!(sccb->fac118 & 0x08);
sclp.has_hvs = !!(sccb->fac119 & 0x80);
sclp.has_kss = !!(sccb->fac98 & 0x01);
+ sclp.has_sipl = !!(sccb->cbl & 0x02);
+ sclp.has_sipl_g2 = !!(sccb->cbl & 0x04);
if (sccb->fac85 & 0x02)
S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
if (sccb->fac91 & 0x40)